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The following relational database schema represents part of a simplified database used by a library:
tblBook (BookID, Title, PublisherID, Category,Price) tblPublisher (PublisherID, PublisherName,PublisherCity) tblAuthor (AuthorID, AuthorName, AuthorCity) tblBookAuthor (BookID, AuthorID)
a) Draw an ERD for the above relational schema.
b) Write SQL statements to perform the following queries.
i) List the title and price of all books with category 'Database' sorted in alphabetical order of title and ascending order of price ii) List the categories and the average price of a book in each category. iii) List the title and category of the most expensive book. iv) List the title and price of all 'Internet' books published by 'McGraw-Hill'. v) List the author who has written the most expensive book.
Explain Deadlock detection and recovery Deadlock Detection - A deadlock is said to take place when there is a circular chain of transaction, every waiting for the release of a
An example of a weak entity is Staff because the availabilityID cannot be uniquely identified unless it is used in conjunction with the foreign key known as availabilityID in the A
Give an example of Operations from the functions of a bank. For creation of a saving account, you can write: bank::: create -savings-account (customer)->account. For oper
Timestamp Ordering Protocol A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item
education.
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
Consider the following database schema: STAFF(StaffNo, fName, lName, Position, sex, dob, branchNo) BRANCH(BranchNo, Street, City) Assume the following for the above database
State as Location within a Program In this traditional approach, location of control inside a program totally defines the program state. Any finite state machine may be implem
Shared lock or Read Lock It is requested by a transaction that needs to just read the value of data item. A shared lock on a data item does not permit an exclusive lock
#question.what is mapping constraints and types?.
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